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				<p>AJAX免费接口：
					<a href="http://www.bejson.com/knownjson/webInterface/" target="_blank">
						http://www.bejson.com/knownjson/webInterface/
					</a>
				</p>
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				<h4>Ajax优缺点</h4>
				<div>优点：</div>
				<ul>
					<li>无刷新更新数据</li>
					<li>异步与服务器通信</li>
					<li>前后端负载均衡</li>
					<li>前后端分离</li>
				</ul>
				<div>缺点</div>
				<ul>
					<li>干掉了 back 和 history 功能，对浏览器机制破坏</li>
					<li>Ajax安全问题</li>
					<li>对seo支持较差</li>
				</ul>
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